Hello Pete,
Thank you for posting. Do you have any other USB devices and if so are they working correctly? We need to make sure that there aren’t any problems with the core system files on your machine. I would like for you to run the system file checker:
System File Checker
1. Click on Start
2. Click All Programs
3. Click Accessories
4. Right click on Command Prompt and then click Run as Administrator
5. Type this command sfc /scannow
This will scan the system files looking for error and will automatically repair or replace any corrupted files.
Let us know what the scan finds.
Thanks,
Jack